January 2019 1 20 Report
Rozwiąż układy równań metodą podstawiania.
 \left \{ {{8x-6y=10} \atop {7x+y=5}} \right.
 \left \{ {{12p-7r=-16} \atop {p-3r=-69}} \right.
 \left \{ {{5x+6y=8} \atop {x-4y=-1}} \right.

Dam naj :)
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